Chat Typing Lag (1st letter omitted) + Console Key
1) Often times when I press K to chat to the team on PC, it cuts off the very first letter of the first word that I type. I believe that this is due to the chat prompt appearing a little too slowly. So, when I press K to type "hello", I'll get "ello" instead. This may not seem important at first, but when you're communicating urgent info, you may be forced to retype it multiple times or more slowly to get the message across. E.g. when I want to say "behind!", it'll show up as "ehind!" So, it may not be as apparent to the team what I'm writing (that the enemy is behind us). Although this may be a bug, I remember this chat lag characteristic in previous Battlefields, so it's become a sort of inter-title lurking feature.
2) The other lurking feature is the console key (~) for PC users... I get that it's necessary for devs and it's a great feature to have to input commands from players. However, I often hit the console key which obviously seizes all input into the players' in-game actions until I hit it again.
Perhaps both of these in-game characteristics can be updated so that the 1) chat prompt appears quicker, and 2) the console key can be disabled in Options (or other comparable fix).